proto-list-deep

An extension of isaacs' proto-list that exposes a deepSnapshot. This returns
a different result than snapshot. Whereas snapshot is implicitly merging
all keys at the top level due to the prototype chain, deepSnapshot first
flattens each 'level' of the proto-list, grabs all the values, then unflattens
the result back to its original depth.

Proto-list-deep does not disturb any of proto-list's functionality (and passes
all of proto-list's tests), so you can use it in place of proto-list if you
wish.

Important Caveat

Proto-list-deep flattens the objects by concatenating keys together with a
delimeter. By default it uses :. So, your object keys CANNOT contain this
delimeter, else the unflattening will fail. You can change this delimeter
in the ProtoListDeep() constructor.